I used the current command in Limma to create volcanoplot, the Y axis is "LogOdds" and X axis is "Log2FoldChange".

I would like to have Y axis as "log10Pvalue". how to do that? please advise

Thanks, Mahyar 

You can't. If you want to have log-p-values on the y-axis, you'll have to do some ugly hacks, like:

fitmod <- fit # after eBayes()
fitmod$lods <- -log10(fitmod$p.value)
volcanoplot(fitmod, ylab="- log10 Pvalue")

Also see A: Volcano plot labeling troubles for why log-odds are preferred for volcano plots.